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Old 3rd May 2011, 04:09 PM   #21
dadod is offline dadod  Croatia
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Quote:
Originally Posted by Edmond Stuart View Post
Not necessarily, see: Rebirth of the Phoenix

Cheers,
E.
although this might result in somewhat reduced bias stability with unregulated power supplies.
...............
That is what I tried to solve with CSS boostrap in proposed schematic. Did you look at it?
dado
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Old 3rd May 2011, 05:54 PM   #22
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Default wheels

Quote:
Originally Posted by homemodder View Post
Welcome back Edmond.
Thanks.
But for how long? I'm still involved with other things (my bike electronics and increasing the income of my GF, Iron Condors? )

Quote:
Re-Re invention of the wheel

Pioneer used this topology in more refined version in two or three of their exclusive no global feedback amps back in the 80s.
Oh well........

Cheers,
E.
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Old 3rd May 2011, 05:55 PM   #23
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Quote:
Originally Posted by dadod View Post
although this might result in somewhat reduced bias stability with unregulated power supplies.
...............
That is what I tried to solve with CSS boostrap in proposed schematic. Did you look at it?
dado
Hi Dado,

I like to look at it, but where?
edit : gimme a link

Cheers,
E.
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Last edited by Edmond Stuart; 3rd May 2011 at 06:23 PM.
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Old 3rd May 2011, 06:25 PM   #24
CBS240 is offline CBS240  United States
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I believe Dado is referring to the ckt in post 2. I have used bootstrapping like this to supply the drivers in a HEC follower. This way I only need to regulate a few mA for the pre-driver stages. Works great! I plan to use a more refined version in my next proto.
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Old 3rd May 2011, 06:38 PM   #25
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I got it.Thanks CBS.

Cheers,
E.
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Old 3rd May 2011, 06:44 PM   #26
dadod is offline dadod  Croatia
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Quote:
Originally Posted by CBS240 View Post
I believe Dado is referring to the ckt in post 2. I have used bootstrapping like this to supply the drivers in a HEC follower. This way I only need to regulate a few mA for the pre-driver stages. Works great! I plan to use a more refined version in my next proto.
Yes that it is, thanks CBS240.
dado
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Old 4th May 2011, 12:23 PM   #27
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Wow, a circuit named after me ! As others have pointed out, there's is no reason for this, as it has been around for quite some time--just not with the attention it deserves, so I put it in my little paper.

Regarding replacing the CCSs with a bootstrapping arrangement: we need to carefully look at what actually limits output swing. If the small-signal stages of the amplifier are powered from a filtered/regulated supply which has lower voltage than the supply for the power transistors, the voltage swing limit will usually stem from the second stage, not the output buffer. In this case there is little reason to not just use CCSs.

Samuel
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Old 4th May 2011, 12:43 PM   #28
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You really dislike a bootstrapping arrangement, don't you?
Because of the electrolytics and/or old school practice?

Cheers,
E.
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Old 4th May 2011, 01:10 PM   #29
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Default bias stability

Quote:
Originally Posted by dadod View Post
although this might result in somewhat reduced bias stability with unregulated power supplies.
...............
That is what I tried to solve with CSS boostrap in proposed schematic. Did you look at it?
dado
Hi Dado,

Of course you can do it that way and it should work.
But despite a perfect CCS, the OPS bias level still depends on the voltage of the main (and unregulated) power supply. To what extent depends on the Early voltage of the output devices. That's why I followed a different route to stabilize the bias level of the phoenix amp.

Cheers,
E.
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Old 4th May 2011, 01:37 PM   #30
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Default phoenix bias

By the way, below the bias as function of the supply voltage.
Red: CCS
Green: Compensated bootstrap
Which of the two do you prefer?

Cheers,
E.
Attached Images
File Type: png phoenix-bias.png (7.5 KB, 145 views)
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